下图是实验室常用的制取和收集干燥气体的装置。(碱石灰是CaO和 Na

下图是实验室常用的制取和收集干燥气体的装置。(碱石灰是CaO NaOH固体的混合物)

1)写出图中有标号仪器的名称:a                        b                  

2)这套装置能用于制取的气体是                       。写出实验室制取这种气体的化学方程式:                                           

3)碱石灰所起的作用是                 

答案

1)长颈漏斗1;锥形瓶1;(2O212H2O22H2O+O22  3)干燥1

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